| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] difficult [to-vb] how | 184 |
|
| 2 | [is] difficult [to-vb] just | 12 |
|
| 3 | difficult [to-vb] just how | 11 |
|
| 4 | [is] [to-vb] just how | 5 |
|
